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NASA Technical Reports Server (NTRS) (686.496 recursos)

The NTRS is a valuable resource for students, educators, researchers, and the public for access to NASA's current and historical technical literature since it was first released in 1994. NTRS provides access to approximately 500K aerospace related citations, 90K full-text online documents, and 111K images and videos. NTRS numbers continues to grow over time as new scientific and technical information (STI) is created or funded by NASA. The type of information found in NTRS include: conference papers, images, journal articles, photos, meeting papers, movies, patents, research reports, and technical videos.

Mostrando recursos 181 - 200 de 321.855

  1. One Giant Leap to Protect All Mankind: An Overview of the Lunar Receiving Laborator

    Hayes, Judith; Dooling, Jackson
    No abstract available

  2. Abstract - Belbas, Nicholas (EC2)

    Belbas, Nicholas
    Originally, I was brought into the Design and Analysis Branch in the Crew and Thermal Systems to work on administrative tasks like archiving and scheduling. However, I ended up splitting my time between secretarial tasks and a technical project. My technical project was originally meant to be a wireless sensor package for the 20ft Spacecraft Thermal Vacuum Chamber in the B7 High Bay. I would be using a miniature wifi development board and a temperature/humidity sensor along with custom 3D modeling to accomplish this. However, after some discussion with my technical mentor, the plan was changed to a mobile autonomous...

  3. Presentation to New Albany High School

    Richey, Austin
    No abstract available

  4. Beyond DNA Sequencing in Space: Current and Future Omics Capabilities of the Biomolecule Sequencer Payload

    Wallace, Sarah
    Why do we need a DNA sequencer to support the human exploration of space? (A) Operational environmental monitoring; (1) Identification of contaminating microbes, (2) Infectious disease diagnosis, (3) Reduce down mass (sample return for environmental monitoring, crew health, etc.). (B) Research; (1) Human, (2) Animal, (3) Microbes/Cell lines, (4) Plant. (C) Med Ops; (1) Response to countermeasures, (2) Radiation, (3) Real-time analysis can influence medical intervention. (C) Support astrobiology science investigations; (1) Technology superiorly suited to in situ nucleic acid-based life detection, (2) Functional testing for integration into robotics for extraplanetary exploration mission.

  5. Results of the Alternative Water Processor Test, A Novel Technology for Exploration Wastewater Remediation

    Meyer, Caitlin; Vega, Leticia
    Biologically-based water recovery systems are a regenerative, low energy alternative to physiochemical processes to reclaim water from wastewater. This paper summarizes the results of the Alternative Water Processor (AWP) test conducted over one year. The AWP recovered 90% of water from four crewmembers using (4) membrane aerated bioreactors (MABRs) to remove carbon and nitrogen from an exploration mission wastewater, including urine, hygiene, laundry and humidity condensate. Downstream, a coupled forward and reverse osmosis system removed large organics and inorganic salts from the biological system effluent. The system exceeded the overall objectives of the test by recovering 90% of the influent...

  6. Small Particle Impact Damage on Different Glass Substrates

    Waxman, R.; Gray, P.; Guven, I.
    Impact experiments using sand particles were performed on four distinct glass substrates. The sand particles were characterized using the X-Ray micro-CT technique; 3-D reconstruction of the particles was followed by further size and shape analyses. High-speed video footage from impact tests was used to calculate the incoming and rebound velocities of the individual sand impact events, as well as particle volume. Further, video analysis was used in conjunction with optical and scanning electron microscopy to relate the incoming velocity and shape of the particles to subsequent fractures, including both radial and lateral cracks. Analysis was performed using peridynamic simulations.

  7. Water Hammer Simulations of Monomethylhydrazine Propellant

    Ramachandran, N.; Burkhardt, Zachary; Majumdar, A.
    Fluid Transient analysis is important for the design of spacecraft propulsion system to ensure structural stability of the system in the event of sudden closing or opening of the valve. Generalized Fluid System Simulation Program (GFSSP), a general purpose flow network code developed at NASA/MSFC is capable of simulating pressure surge due to sudden opening or closing of valve when thermodynamic properties of real fluid are available for the entire range of simulation. Specifically GFSSP needs an accurate representation of pressure density relationship in order to predict pressure surge during a fluid transient. Unfortunately, the available thermodynamic property programs such...

  8. In-Space and Extra-Terrestrial Plume Environments

    West, Jeff; Liever, Peter
    No abstract available

  9. A Comparison of Results from NASA's Meteoroid Engineering Model to the Long Duration Exposure Facility Cratering Record

    Moorhead, Althea; Cooke, William J.; Ehlert, Steven
    No abstract available

  10. Characterizing the 2016 Perseid Meteor Shower Outburst

    Stober, G.; Molau, S.; Blaauw, R. C.; Moser, D. E.; Schult, C.
    The Perseid meteor shower has been observed for millennia and is known for its visually spectacular meteors and occasional outbursts. Normal activity displays Zenithal Hourly Rates (ZHRs) of approximately100. The Perseids were expected to outburst in 2016, primarily due to particles released during the 1862 and 1479 revolutions of parent Comet Swift-Tuttle. NASA's Meteoroid Environment Office predicted the timing, strength and duration of the outburst for spacecraft risk using the MSFC Meteoroid Stream Model [1]. A double peak was predicted, with an outburst displaying a ZHR of 210 +/- 50 at 00:30 UTC Aug 12 (139.5deg Solar Longitude), and a...

  11. Luminous Efficiency of Hypervelocity Meteoroid Impacts on the Moon Derived from the 2015 Geminid Meteor Shower

    Moser, D. E.; Suggs, R. M.; Ehlert, S. R.
    Since early 2006 the Meteoroid Environment Office (MEO) at NASA's Marshall Space Flight Center has routinely monitored the Moon for impact flashes produced by meteoroids striking the lunar surface. Activity from the Geminid meteor shower (EM) was observed in 2015, resulting in the detection of 45 lunar impact flashes (roughly 10% of the NASA dataset), in about 10 hours of observation with peak R magnitudes ranging from 6.5 to 11. A subset of 30 of these flashes, observed 14-15 December, was analyzed in order to determine the luminous efficiency, the ratio of emitted luminous energy to the meteoroid's kinetic energy....

  12. Meteor Shower Forecasting for Spacecraft Operations

    Cooke, William J.; Moorhead, Althea V.; Campbell-Brown, Margaret D.
    No abstract available

  13. The Velocity and Density Distribution of Earth-Intersecting Meteoroids: Implications for Environment Models

    Cooke, Bill; Brown, Peter; Campbell-Brown, Margaret; Moser, Danielle; Moorhead, Althea; Blaauw, Rhiannon
    No abstract available

  14. Meteor Shower Forecasting for Spacecraft Operations

    Campbell-Brown, Margaret D.; Moorhead, Althea V.; Cooke, William J.
    Although sporadic meteoroids generally pose a much greater hazard to spacecraft than shower meteoroids, meteor showers can significantly increase the risk of damage over short time periods. Because showers are brief, it is sometimes possible to mitigate the risk operationally, which requires accurate predictions of shower activity. NASA's Meteoroid Environment Office (MEO) generates an annual meteor shower forecast that describes the variations in the near-Earth meteoroid flux produced by meteor showers, and presents the shower flux both in absolute terms and relative to the sporadic flux. The shower forecast incorporates model predictions of annual variations in shower activity and quotes...

  15. A Comparison of Damaging Meteoroid and Orbital Debris Fluxes in Earth Orbit

    Vavrin, Andrew; Moorhead, Althea V.; Cooke, William; Matney, Mark
    Low Earth orbit is populated with a substantial amount of orbital debris, and it is usually assumed that the flux from these objects contributes to most of the hypervelocity particle risk to spacecraft in this region. The meteoroid flux is known to be dominant at very low altitudes (<300 km), where atmospheric drag rapidly removes debris, and at very high altitudes beyond GEO (geostationary), where debris is practically non-existent. The vagueness of these boundaries has prompted this work, in which we compare the fluxes of meteoroids and orbital debris capable of penetrating a millimeter thick aluminum plate for circular orbits...

  16. Cryogenic Fluid Management Technology Development Roadmaps

    Johnson, Wesley L.; Stephens, Jonathan R.
    No abstract available

  17. A Comparison of Damaging Meteoroid and Orbital Debris Fluxes in Earth Orbit

    Moorhead, Althea V.; Cooke, William; Vavrin, Andrew; Matney, Mark
    No abstract available

  18. Meteor Shower Forecasting for Spacecraft Operations

    Campbell-Brown, Margaret; Cooke, Bill; Moorhead, Althea
    No abstract available

  19. A Comparison of Results from NASA's Meteoroid Engineering Model to the LDEF Cratering Record

    Cooke, W. J.; Ehlert, S.; Moorhead, A
    NASA's Long Duration Exposure Facility (LDEF) has provided an extensive record of the meteoroid environment in low Earth orbit. LDEF's combination of fixed orientation, large collecting area, and long lifetime imposes constraints on the absolute flux of potentially hazardous meteoroids. The relative impact rate on each of LDEF's fourteen surfaces arises from the underlying velocity distribution and directionality of the meteoroid environment. For the first time, we model the meteoroid environment encountered by LDEF over its operational lifetime using NASA's Meteoroid Engineering Model Release 2 (MEMR2) and compare the model results with the observed craters of potentially hazardous meteoroids (i.e....

  20. The Velocity and Density Distribution of Earth-Intersecting Meteoroids: Implications for Environment Models

    Moser, D. E.; Cooke, W. J.; Brown, P. G.; Moorhead, A. V.; Blaauw, R. C.; Campbell-Brown, M. D.
    No abstract available

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